Telephonic apparatus.



No. 759,697. PATENTED MAY 10,-1904. A. GRAHAM.

TELEPHONIG APPARATUS.

APPLICATION FILED FEB. 4. 1903.

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No. 759,697. PATENTED MAY10,'1904. A. GRAHAM.

TELBPHONIG APPARATUS.

APPLIUATION FILED FEB. 4., 1903.

N0 MODEL. 9 SHEETS-SHBET 2.

No. 759,697. PATENTED MAY 10, 1904. A. GRAHAM. TELBPHONIG APPARATUS.

APPLICATION FILED FEB. 4. 1903. N0 MODEL 9 SHEBTS-BHEBT 3.

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No. 759,697. PATBNTBD MAY 10, 1904.

A. GRAHALL; TELEPHONIG APPARATUS.

APPLICATION FILED FEB. 4. 1903.

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H0 MODEL.

PATENTED MAY 10, 1904.

- A. GRAHAM.

TELEPHONE APPARATUS.

APPLIgLTION FILED FEB. 4. 1903. N0 MODEL. SHEETS-SHEET 6.

ITO-759,697. PATBNTBD MAY 10 1904. A. GRAHAM. TBLEPHONIG APPARATUS.

APPLICATION TILED FEB. 4. 1903.

N0 MODEL. 9 SHEETS-SHEET 7.

No. 759,697. PATBNTED MAY 10, 1904. A. GRAHAM.

TBLEPHONIG APPARATUS.

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PATENTED MAY 10, 1904.

9 BHEETS-SHEET 9 t A. GRAHAM. TELEPHONIG APPARATUS.

APPLIUAjfION FILED FEB. 4. 1903.

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said former specification.

2 UNITED STATES i atented May 10, 1904:

PATENT OFFICE.

ALFRED GRAHAM, OF LONDON, ENG-LAND.

TELEPHONIC APPARATUS.

SPECIFICATION forming part of Letters Patent No. 759,697, dated May 10, 1904.

Application filed February 4, 1903- Scrial No. 141,924. (No model.)

To aZZ whom it may concern.-

Be it known that I, ALrnnn GRAHAM, asubject of the King of Great Britain and Ireland,

residing at Denmark Hill, London, England, have invented Improvements in Telephonic Apparatus, of which the following is a speciiication.

This invention has reference to various improvements in telephonic apparatus; and it has for its object to construct such apparatus in a simpler, more compact, and waterproof manner than heretofore usual.

The invention consists in variousnovel features of construction and in combinations and arrangements of parts, all as hereinafter more fully described, and pointed out in the claims. In the accompanylng illustratlve drawings, Figure 1 1s a front elevation, Fig. 2 a front elevation with the cover removed and part of Fig. 8 is a front View, Fig. 9 a front view with the cover removed, Fig. 10 a section on the line (J U of Fig. 9, and Fig. 11 a section on the line I) D of Fig. 10 viewed from below, showing a modified construction. Fig. 12 is a cross-section on the line E E of Fig. 9. I

In the construction shown in Figs. 1 to 7, inclusive, the waterproof telephonic transmitter (marked collectively 1) is of the kind described in the specification of former Letters Patent granted to me, No. 655,620, and comprises a carbon disk or diaphragm 1, coated on its outer side with metal foil and clamped between two metal rings 1 1, that are secured together and to the metal foil, and a disk-like block 1 of insulating materialfor example, vulcanized liberin a water tight manner, a carbon cup 1, arranged between the carbon diaphragm and block and charged with carbon powder 1 a ring 1, of soft material, such as felt, to keep the carbon powder in position, and a ring 1 for holding the carbon cup in place, all as described in my According to the The holder 2 is formed withan annular rearward extension 2, that extends through the cover 8" of the casing 8, to which it is connected in a rotary manner by a ringS), that is fixed to the said extension by screws 10 "and bears against the inner side of the said cover. A water-tight joint is formed between the holder 2 and cover 8 by forming adjacent portions of these parts with oppositely-arranged annular grooves 11 11, respectively, of semicircular section, and fitting between them apacking-ring 12, of suitable material, such as lamp-wick of circular section saturated with tallow. The opening 2" in the front of the holder 2 opposite thetransmitterdiaphragm 1? is provided with a'sheet 13, of perforated material, to protect such diaphragm, the said opening being larger than the exposed portion of the diaphragm and so formed and arranged that" any rain or-inoisture that may enter the said opening can easily drain away from the front of such opening.

In the example there is for the purposementioned a ring 14, of india-rubber, between the adjacent front peripheral portions of the holder 2 and transmitter-case, the inner periphery of the said ring being slightly less in diameter than that of the said opening 2". The cover 8 is made removable, and a watertight-joint is made between it and the front end of the casing 8 by a packing-ring 15. The side of the casing is formed with a branch opening 16 for the passage of the insulated conductors hereinafter referred to, and-this opening is fitted with a gland orbush 17, that can be secured in a water-tight mannerin the said opening and can be sweated to the lead covering-of the said conductors, so as to avoid any liability of moisture entering the casing at this point. The rear wall 8 of the casing 8 has cast in it a vertical passage 18, Fig. 3, that terminates at its upper end in a hole 19, communicating with the interior of the casing, and at its lower end in a flanged part 20, to which is fixed the rear end 21 of a hearing-tube 22, that extends to the front of the apparatus and terminates, preferably, in a trumpet-shaped mouth 23. The passage 18 and tube 22 together form a doubly-bent soundpassage by which the telephonically-produced sounds can be heard in a louder and better manner than is the case in instruments in which a sound-passage having a single bend is used. Over the hole 19 in the rear wall of the casing 8 is fixed in a vertical position a telephonic receiver of the kind described in the specification of my said former patent, No. 655,620, and comprising a diaphragm 25, held in a vertically-arranged circular frame 26, and a permanent magnet 27, of partly-circular shape, having inwardly-bent ends 27 each of which carries a polar extension 27 that extends at right angles to the plane of the magnet and toward the receiver-diaphragm 25 and is provided with a coil of wire 28. The two coils 28 are connected in series and to two terminals 29 and 30, Fig. 2, that are respectively fixed on two blocks 31 and 32, of insulating material. To the block 31 are fixed two other contacts 34 and 35, which respectively carry spring-blades 36 and 37, arranged to respectively bear against the two concentric metal terminals 4 and 3 of the rotary transmitter 1. Fixed upon the block 32 are anumber of other insulated contactsviz. 39, 39", 30, 41,42, and 43and also two bearings 44 and 45, in which is mounted to turn a spindle 46, carrying a cylinder 47, of insulating material, (hereinafter called for distinction the switch-cylinder,) which carries two separate contact-pins 48 and 49 and a longitudinally-arranged contact-strip 50. The contact-pin 48 is normally held by the switch-cylinder 47 under the action of a spring 51 between two spring-contacts 52 and 53, that are respectively connected to terminals 39" and 40. The other contactpin 49 is normally out of use, but is so arranged, as shown, that by partly turning the switch-cylinder 47 in the direction of the arrow '00, Fig. 2, it will be caused to bear between two other spring-contacts 54 and 55, that are connected, respectively, to the terminals 30 and 39*, the contact-pin 48 then passing out of connection with its pair of spring-contacts 52 and 53. The terminals 41 and 42, respectively, carry spring-blades 56 and 57, that rest against the switch-cylinder 47 and are adapted to simultaneously bear upon the contact-strip 5O thereon when the said cylinder is turned sufficiently against the actionof its spring 51 to cause the pin 49 to bear against the contact-springs 54 and 55.

Terminal 43 is connected to terminal 34 by a hold the latter in its outer and inoperative position. 61 is a washer of india-rubber to insure a water-tight joint between the push 60 and cover 8. The inner end of the push 60 is tipped with insulating material 61 to prevent short-circuiting of the spring-blade 59 when the push 60 is forced inward against the same. Terminals 39 and 39* are electrically connected together by a conductor 39, and terminals 35 and 42 are connected together by a conductor 35*.

When the apparatus is to be used, terminal 29 is connected to one pole of a battery 62 and to a return-conductor E by a conductor 63, Figs. 2 and 6. .Terminal 43 is connected to the other pole of the battery 62 by a conductor 64. Terminals 39 and 41 are respectively connected to two separate insu lated line-wires 65 and 66, that extend to another similar apparatus at a distance, and terminal 40 is connected by a conductor 67 to one terminal of a bell 68, the other terminal of which is connected by a conductor 67 to the return-conductor E. The five conductors 63, 64, 65, 66, and 67 for effecting the above connections are insulated from each other and formed into two lead-covered cables 69, Fig. 2, that extend through the lateral branch 16 of the casing 8 and are sweated to the bush or gland 17, which is secured in a water-tight manner in the said branch. The spindle 46, carrying the switch-cylinder 47, extends through a stufifing-box in the wall of the casing 8 and is provided at its outer end with a hand-lever 71. Encircling the said spindle is the spring 51, one end of which is fixed to the spindle and the other end of which is fixed to the adjacent bearing 45.

The working of two connected instruments, each constructed as described and located at two separate stations (0 and b, is as follows, reference being had toFigs. 6 and 7: The line-wires 65 and 66, connected, respectively, to the terminals 39 and 41 of the instrument at station .a, are connected, respectively, to the terminals 41 and 39 of the other instrument at station 6. Normally both switchcylinders 47 are in the position shown in Fig. 6, so that the transmitter 1 and receiver-coils 28 of each instrument are out of circuit, the transmitter-circuit being open between the spring-blades 56 and 57 and the circuit of the receiver-coils 28 being open between the spring-contacts 54 and 55. Each bell 68 is, however, adapted to be brought into circuit turning the hand-lever 71.

and caused to ring by forcing inward the bell-push of the other instrument. Assuming the bell-push 60 of the instrument at station to be forced inward, then the circuit of bell 68 at station 6!; will be from one pole of the battery 62 at station 5 through the parts 64, 43, 59, and 41 41 of the instrument at station 7), theline-wire 65, and the parts 39,

39", 39*, 52, 48, 53, 40, and 67 of the instrument at station a to the bell 68 at that station, and thence by conductor 67 to the return-conductor E, through Which-the circuit is completed to the other pole of the battery 62 at station I). The bell 68 at station 7) can be rung to acknowledge the receipt of the call-signal at station a or to ring up station 5 by pressing in the bell-push 60 at station a, current then passing fromthe battery 62 at that station through the parts 64, 43, 59, and 41* 41 at station a through line-wire 66 to terminal 39 of the instrument at station Z), the circuit being tacts 52 and 53, each transmitter-circuit will be closed between the spring-contacts 56 and 57 by the contact 50, and the circuit of the receiver-coils 28 will be closed between the spring-contacts 54 and 55 by pin 49. Fig. 7 shows the new position of the various parts. The telephonic circuit of the transmitter of the instrument at stationa/ and the receiver of the instrument at station 6 will then be completed from battery 62 at station a through the parts 64 43 58 34 36, transmitter 1, and parts 37, 35,35 42, 57, 50, 56, and 41 of instrument at a, line-wire 66, and parts 39 39 39* 55 49 54 30, receiver-coils 28, and parts 29 and 63 of instrument at I) to the return-conductor E, and thence back to the battery 62 at station ct. The telephonic circuit of the transmitter of the instrument at station 6 and the receiver of the instrument at station a will at the same time becompleted from the battery 62 at station 7) through the parts 64 43 58 34 36, transmitter 1, and parts 37, 35, 35*, 42, 57, 50, 56, and 41 of instrument at station 6, line-wire 65, and parts 39 39739 55 49 54 30, receivercoils 28, and parts 29 and 63 of instrument at station 66 to the return-conductor E, and thence back to the battery 62 at station 7).

Upon releasing the hand-lever 71 of each instrument the corresponding switch-cylinder 47, with contacts 48, 49, and 50, will be automatically returned to their normal positions (shown in Fig. 6) by the action of the spring 51.

By the construction described it will be seen that the rotary holder 2, with waterproof transmitter, can be readily rotated from time to time to shake up the carbon particles of the transmitter, that the switch-operating device 47 can be operated independently of the transmitter, and that the interior of the easing 8 is rendered practically waterproof at all points, so that the apparatus will remain in an eliicient condition even in exposed positions.

As will be obvious, telephonic apparatus of the kind hereinbefore described, wherein the transmitter is mounted to rotate in a watertight manner on the front cover of the watertight casing 8, and the switch-operatingdevice is disconnected from the transmitter and the receiver arranged vertically at the back of the casing over the inner end of a bent passage that is formed in the rear wall of the easing and communicates with one or more tubes through which the sounds produced by the telephonic receiver can be heard, can be variously modified, also that the switch-operating device can be operated from the exterior of the casing in various ways independently of the transmitter otherwise than as hereinbefore described-as, for example, from a retary tube that is arranged to come into communication with the sound-passage 18 and is connected to one or more hearing-tubes. Figs. 8 to 11 show an arrangement of the latter kind wherein the movable contacts 48, 49, and 5O of the switch, corresponding to the parts 48, 49, and 50, respectively, of the switch in Figs. 1 to 7, inclusive, are carried by an insulating switch cylinder or sleeve made in two parts 72 73, that are fixed upon a rotary tube 74, that extends across the casing 8 and the ends of which are in communication with two bent downwardly-extending tubes 76, the lower ends of which are bent toward each other and enlarged, as shown at 77, and provided with rubber rings 78 to form earpieces that can be caused to fit closely against the ears of the person using the apparatus. The rotary tube 74 is at a part thereof within the casing 8 formed with a slot 80, adapted to be brought opposite the opening .19 of the upper end of the vertical passage 18, so that the vibrations from the receiver-diaphragm 25 can enter the rotary tube and pass by the tubes 76 to the earpieces 77. The central portion of the tube 74, in which the slot 80 is formed, is covered by a cap-piece 81 or is otherwise adapted to prevent communication between the said passage 18 andthe interior of the casing 8. One of the tubes 76-for instance, the right-hand one-may be of rigid material and the other of flexible materal, shown, so that when a person applies one ear to the right-hand earpiece the left-hand earpiece can be readily applied to his other ear. in this modified arrangement the electrical contacts and connections are substantially similar to those in the arrangement shown in Figs. 1 to 7, inclusive, and are similarly marked, but with an index-letter a attached. The pin 48 normally bears against and between two springcontacts 52 and 53, fixed, respectively, to the terminals 39 and 40 for closing the bell-circuit at this point, while the contacts 49 and 50 are in their inoperative positions in which the transmitter and receiver are out of circuit. WVhen, however, the rotary tube 7 4 is moved in the direction of the arrow y, Fig. 9, the pin 48 is moved into its inoperative position and pin 49 is caused to bear against and between the spring-contacts 52 and 54, connected, respectively, to terminals 39 and 30, so as to then close the receiver-circuit, and pin 50 is caused to bear against and between the spring-contacts 56 and 57, connected, respectively, to terminals 41 and 42, so as to then close the transmittercircuit. 59 is the spring-contact connected to terminal 43 and adapted to be forced by the bell-push 60 into contact with the terminal 41*. In this arrangement, for convenience of coupling-up, terminal 41 is connected to terminal 34 by a conductor 82, terminal 41' is disconnected from terminal 41 and connected by a conductor 83 to terminal 35, which is connected direct to the line-wire 66, and terminal 42 is connected by a conductor 84 to terminal 43, which is connected, as before, to the battery-wire 64. Terminal 29 is connected to one pole of the battery 62, terminal 39 to line-wire 65, and terminal 40 to the bellwire 67 as before. In this case the circuit of the bell 68, belonging to the instrument, Fig. 9, is normally completed, as before, through the parts 65 39 52 48 53 40 67, bell 68, and parts 67 to return-conductor E. The circuit of the transmitter of the instrument when the switch is operated to complete such circuit is from one pole of the battery 62 through parts 64 43 84 42 57 50 56 41 82 34 '36, transmitter 37 35 to linewire 66, and the circuit of the receiver of the said instrument is at the same time from linewire 65 through the parts 39 52 49 54 30, receiver-coils 28, and parts 29 and 63 to the return-conductorE. The circuit connections are thus substantially like those in the arrangement shown in Figs. 1 to 7, inclusive. When one hearing-tube 7 6 is of rigid material and the other of flexible tubing, as in the example shown, the upper end of the latter tube may be connected to a tubular junctionpieee 90, that is fixed to the casing 8 at 91, as shown in Fig. 11, and is provided with a tubular extension 92, between which and the junction-piece is an annular recess 93. The other or rigid tube 7 6 is fixed to one end of the rotary tube 7 4, which extends through a bearing 94 in the casing 8, and the other end of which fits over the fixed tubular extension 92 and into the recess 93. With this arrangement sound-waves entering the rotubes 76.

tary tube 7 4 from the passage 18 are pre= vented from escaping except through the two The rigid tube 7 6 may be normally held in the position to complete the bellcircuit and out out the transmitter and receiver by a spring catch or holder that can be of any suitable construction capable of readily permitting the tube to be moved forward into position to be applied to one of the users ears and simultaneously put the bell out of circuit and the transmitter and receiver in circuit. In the example shown in Figs. 8 and 9 the catch or holder comprises a pin 95, provided with a knob 96, and fixed to a second pin 97, secured to the casing 8.

That I claim is 1. Telephonic apparatus comprising a water-tight casing having at its rear end an upwardly-extending sound-delivery passage one end of which communicates with the interior of the casing through a hole in the rear wall thereof, a receiver arranged vertically within and at the rear portion of said casing and having its diaphragm secured over said hole, a transmitter rotatably secured to the front of the casing, a hearing-tube having one end in connection with the second end of the sounddelivery tube, and means located within said casing and capable of being operated from the exterior thereof for controlling the circuits of said receiver and transmitter.

2. Telephonic apparatus comprising a casing provided with a sound -passage arranged to communicate with the interior of said casing through a hole in the rear wall thereof, a hearing-tube in connection with said passage, a holder with waterproof telephonic transmitter secured in a rotary and water-tight manner to the front of said casing, a telephonic receiver having its diaphragm secured over the hole in the rear wall of said casing, transmitter, receiver and bell terminals located within said casing, a switch located within said casing but disconnected from said transmitter and holder and adapted to control the circuits of said transmitter, receiver and abell, as set forth, and means extending through said casing in a water-tight manner and whereby said switch can be operated from the exterior of said casing independently of said transmit ter for controlling said circuits.

3. Telephonic apparatus comprising a cas erated independently of said transmitter from the exterior of said casing for controlling the circuits of said transmitter and receiver.

&. Telephonie apparatus comprising a casing having a passage formed in its rear wall and terminating at one end in a hole extending through said rear wall, a waterproof microphone-transmitter secured in a rotary and water-tight manner to the front end of said casing, a magneto-electric receiver arranged vertically at the rear end of and within said casing with its diaphragm over said hole, a rotary tube extending across said casing and formed with ahole adapted to be brought opposite the other end of said passage, a bearing-tube fixed to said rotary tube and provided with an earpiece, and a switch located within said casing and adapted to control the circuits of said transmitter and receiver, said switch being arranged to be operated from the exterior of said casing independently of transmitter.

5. Telephonic apparatus comprising a casing having a sound-delivery passage communicating with its interior through its rear wall, a waterproof microphone-transmitter secured in a rotary and waterproof manner to the front end of said casing, a telephonic receiver arranged within and at the rear portion of said casing with its diaphragm over said hole, a rotary tube arranged to extend across said casingand having its interior in communication with said passage, an external hearingtube secured to said rotary tube, and a switch located within said casing for controlling the circuits of said transmitter and receiver and arranged to beoperated by movement of said external hearing-tube.

6. Telephonic apparatus comprising a casing having a sound-delivery passage communicating with its interior through its rear Wall, a Waterproof microphone-transmitter secured in a rotary and waterproof manner to the front end of said casing, a telephonic receiver arranged within said casing with its diaphragm over said hole, a rotary tube arranged to extend across said casing and having its interior in communication with said passage, an external hearing-tube secured to said rotary tube, and a switch located within said casing for controlling the circuits of said transmitter and receiver and arranged to be operated from said rotary tube.

7. Telephonic apparatus comprising a casing having a sound-delivery passage communicating withits interior through its rear wall,

a waterproof microphone-transmitter secured in a rotary and waterproof manner to the front end of said casing, a telephonic receiver arranged within said casing with its diaphragm over said hole, a tube arranged across and mounted to rotate in said casing and formed with an opening arranged to be placed in communication with said passage, an external hearing-tube of rigid material fixed to one end of said rotary tube, an external hearing-tube oi flexible material in communication with the other end. of said rotary tube, and a switch located within said casing and capable of controlling the circuits of said transmitter and receiver, said switch being arranged to be operated by movement of said rigid hearingtube.

8. Telephonic apparatus comprising a casing having a sound-delivery passage commu nicating with its interior through its rear wall, awaterproof microphone-transmitter secured in a rotary and waterproof manner to, the front end of said casing, a telephonic receiver arranged within said casing with its diaphragm over said hole, a rotary tube mounted in said casing and formed with an opening arranged to be placed in communication with said passage, external hearing-tubes one of which is of rigid material and is secured to one end of said tube and the other of which is provided with a tubular junction-piece secured to the opposite side of said casing and opposite the other end of said rotary tube, and movable and fixed switch-contacts for controlling the circuits oi. said transmitter and receiver and of a bell, said movable contacts being carried by said rotary tube.

9. 'lelephonic apparatus comprising a casing provided with a sound-delivery passage, a waterproof microphone-transmitter, a holder carrying said transmitter and mounted to rotate in the front cover of said casing, adjacent parts of said holder and cover having oppositely-arranged annular grooves of curved section, a lubricated packing-ring of circular section arranged between said holder and cover and within the juxtaposed grooves so as to form a water-tight joint between them, an annular plate secured to the inner end of said holder and arranged to rotate in contact with the innerside of said cover and retain said holder in place, a receiver arranged within said casing with its diaphragm over one end of said passage, and a switch device located within said casing and adapted to control the circuit of said transmitter and receiver.

10. Telephonic apparatus comprising a cas ing formed at its rear side with avertical passage open at both ends one of which communicates with the interior of said casing through its rear wall, said casing also having an opening in its side for passage of conductors, a holder mounted to rotate on the front of said casing, a microphone-transmitter fixed in said holder and carrying concentrically-arranged terminals located within said casing, a magneto-electric receiver having its diaphragm arranged over the hole in the rear wall of said casing, a rotary tube mounted in said casing and formed with an opening adapted to be brought opposite the second open end of said passage, a movable hearing-tube of rigid material fixed to one end of said rotary tube at one side of said casing, a second movable hearing-tube arranged at the opposite side of said casing and in communication with said rotary tube through its other end, insulated terminals 29, 30, 34, 35, 39, 41, 41*", 42 and 43, spring-contacts 36 and 37 connected to said terminals 34 and 35 and arranged to respectively bear against the concentrically arranged transmitter terminals, spring-contacts 52, 53, and 54 connected respectively to said terminals 39, 40 and 30, spring-contacts 56 and 57 connected respectively to said terminals 41 and 42, a springblade 59 connected to said terminal 43, a bell-push adapted to press said spring-blade 59 into contact with said terminal 41, insulated contacts 48, 49 and 50 carried by said rotary tube, said contact 48 being arranged .to connect said spring-blades 52 and 53 when said rigid hearing-tube is moved into its backward or inoperative position and to move out of contact with said spring-blades 52 and 53 When said rigid tube is moved into its forward or operative position, and said contacts 49 and 50 being arranged to respectively connect the pairs of spring-blades 52, 54, and

56 57 when said rigid tube is moved into the operative position and to disconnect said pairs of blades 52 54 and 56 57 from each other when said rigid tube is moved into its inoperative position, said terminal 29 being connected to terminal 30 through said magneto-electric receiver and adapted to be connected to one pole of an electric generator, said terminals 35 and 39 being adapted to be connected to separate line-wires, terminal 34 being connected to terminal 41, terminal 41* being connected to terminal 35, terminals 42 and 43 being connected together and adapted to be connected to the opposite pole of said electric generator, and said terminal 40 being adapted to be connected to a bell, all substantially as described for the purposes set forth.

Signed at 75, 76, and 7 7 Cornhill, London, E. (1., this 21st day of January, 1903.

ALFRED GRAHAM.

WVitnesses:

HENRY MAYKELS, WM. 0. BROWN. 

